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Find the argument of the complex number 
4-4i in the interval 
0 <= theta < 2pi.
Express your answer in terms of 
pi.
Answer:

Find the argument of the complex number 44i 4-4 i in the interval 0 \leq \theta<2 \pi .\newlineExpress your answer in terms of π \pi .\newlineAnswer:

Full solution

Q. Find the argument of the complex number 44i 4-4 i in the interval 0θ<2π 0 \leq \theta<2 \pi .\newlineExpress your answer in terms of π \pi .\newlineAnswer:
  1. Determine angle for complex number: To find the argument of the complex number 44i4-4i, we need to determine the angle θ\theta that the line connecting the origin to the point (4,4)(4, -4) makes with the positive xx-axis in the complex plane. The argument is the angle in the standard position (counter-clockwise from the positive xx-axis) that the radius vector makes with the positive xx-axis.
  2. Identify quadrant: The complex number 44i4-4i is in the fourth quadrant of the complex plane because the real part is positive and the imaginary part is negative. In the fourth quadrant, the argument θ\theta is related to the angle α\alpha by θ=2πα\theta = 2\pi - \alpha, where α\alpha is the angle the line makes with the negative xx-axis.
  3. Calculate angle α\alpha: To find α\alpha, we use the arctan function, which gives us the angle whose tangent is the ratio of the imaginary part to the real part of the complex number. However, since we are in the fourth quadrant, we need to take the positive value of the imaginary part to find the angle with respect to the negative x-axis. So, α=arctan(4/4)=arctan(1)\alpha = \text{arctan}(|-4|/4) = \text{arctan}(1).
  4. Find arctan(1)\arctan(1): The arctan(1)\arctan(1) is π4\frac{\pi}{4} because the tangent of π4\frac{\pi}{4} is 11. This is a well-known angle from trigonometry.
  5. Calculate final argument: Now we can find the argument θ\theta by subtracting α\alpha from 2π2\pi: θ=2ππ/4=8π/4π/4=7π/4\theta = 2\pi - \pi/4 = 8\pi/4 - \pi/4 = 7\pi/4.

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